Understanding the Axillary Part of the Breast: A Comprehensive Guide

When we think of breast structure, the part that is visible on the chest usually comes to mind. However, breast tissue extends beyond the chest to the underarm (axilla). This special part is called the "axillary tail of the breast." It plays an important role in health, beauty, and even the postpartum breastfeeding process. Whether you have a lump in your armpit, want to learn about breast structure, or want to solve cosmetic problems—this guide has all the answers.

What Is the Axillary Part of the Breast?

The axillary breast is the area of ​​breast tissue extending into the armpit. It is also called "Spence's tail" after the 19th-century anatomist James Spence. It contains glands, fat, and milk ducts. During fetal development, breast tissue forms along the "milk lines" (lines from the armpit to the nipple). Although this tissue mostly disappears, some of it may remain in the armpit and become functional breast tissue. Hormonal changes such as puberty, pregnancy, or menopause can make this area more noticeable.

The Anatomy and Function of the Axillary Breast

This area, like the central breast, contains lobules (milk-producing glands), ducts (ducts that carry milk), and fatty tissue. However, it is adjacent to the axillary lymph nodes (toxin-filtering glands). These lymph nodes help the body fight disease and detect infections.

The two main functions of this area are:

Lymph drainage: The axillary lymph nodes filter toxins from the breast, arm, and chest area. They play a key role in detecting cancer cells.

Milk production: Rarely, axillary tissue can produce milk after childbirth. Women with this area may experience swelling or pain during breastfeeding.

Common Concerns Associated with the Axillary Breast

Although this area is natural, it can bring some physical and psychological challenges:

1. Axillary breast hypertrophy (overgrowth)

In some people, this area becomes larger than normal and appears as a "bulge" under the armpit. It is often mistaken for fat. However, since it is glandular tissue rather than fat, it can be painful with hormonal changes. It can reduce self-confidence when wearing tight clothes or swimsuits.

2. Spontaneous breast tissue (polymastia)

Rarely, a complete breast tissue (including the nipples) can develop in the armpit. This can cause milk production after childbirth and can lead to problems such as cancer.

3. Lumps and abnormalities

Lumps found in this area are usually harmless. Causes:

Fibroadenomas: Non-cancerous lumps that are found in young women.

Cysts: Fluid-filled sacs that form with hormonal changes.

Lipomas: Non-cancerous fatty lumps.

Swollen lymph nodes: Usually caused by infections such as colds.

However, it is important to see a doctor if you have persistent lumps.

Axillary Breast Tissue vs. Armpit Fat: How to Tell the Difference

Identifying these two is key to treatment:

Texture: If the breast tissue is firm and lumpy, the fat is soft.

Pain: Breast tissue can cause pain during periods.

Tests: An ultrasound or mammogram can confirm whether the tissue is present.

If the bulge doesn't go down despite weight loss, it could be breast tissue.

When to See a Doctor: Red Flags

Seek immediate medical attention if you experience these symptoms:

A firm, non-moving lump: This does not change with your menstrual cycle.

Sudden swelling, redness, or warmth: A sign of infection or abscess.

Nipple discharge from the armpit.

Skin changes (dimples or wrinkles): May be an indicator of cancer.

Early detection of problems such as cancer makes treatment easier.

Axillary Breast Cancer: Risks and Detection

Cancer in the axillary tissue is rare, but possible. Like primary breast cancer, it is influenced by genetics, hormones, and lifestyle. However, tumors here are difficult to detect with self-exams or mammograms.

Advice for high-risk individuals:

Perform monthly self-exams (also see underarm area).

Have an axillary ultrasound.

Discuss genetic testing (BRCA mutation) if there is a family history of cancer.

Addressing Cosmetic Concerns: Treatment Options

Options for those suffering from axillary breast tissue include:

Non-surgical methods

Weight loss: Reduces fatty tissue.

Compression garments: Temporarily hide the bulge.

Hormone therapy: Reduces swelling caused by changes in estrogen levels.

Surgical methods

Liposuction: Removes fat, but leaves glandular tissue.

Excision surgery: Removes tissue and excess skin.

Combined technique: Removes both fat and tissue.

Consult with a board-certified plastic surgeon to determine the best option

Recovery After Axillary Breast Surgery

Liposuction: Return to normal life in 1-2 weeks.

Excision: Avoid excessive use of hands for 2-3 weeks. Scars will fade in 6-12 months.

Follow your doctor's instructions to avoid infections or fluid collection.

Debunking Myths About the Axillary Breast

Myth: "Underarm bulge is always just fat."

Fact: It could be breast tissue, a swollen lymph node, or a lipoma.

Myth: "Axillary tissue increases cancer risk."

Fact: The risk is the same as primary breast tissue.

Conclusion

Knowing your axillary breast is key to your health and confidence. Regular self-exams, medical advice, and informed decisions will keep you strong. Whether you want to treat a lump or reduce cosmetic concerns—understanding this unique body structure will empower you.

Remember: The underarm is not just a fold of skin—it’s a window into your breast health. Be aware, ask questions, and consult a doctor when in doubt.

(Note: This information is for general information only. Consult a doctor for specific advice. or Consult our doctor)

Author

Dr. Sireesha Rajesh

Dr. Sireesha Rajesh is a board-certified plastic, cosmetic, and reconstructive surgeon with extensive experience in advanced surgical procedures. She holds an M.B.B.S. and an M.S. in General Surgery, followed by an M.Ch in Plastic and Reconstructive Surgery from KMC, Chennai.

With a deep commitment to precision and patient care, Dr. Sireesha Rajesh specializes in cosmetic, plastic, and reconstructive microvascular surgery, including breast surgery and liposuction. As a life member of prestigious organizations such as BRASA, IAAPS, APSI, and ASI, she stays at the forefront of the latest advancements in aesthetic and reconstructive treatments.

Dr. Sireesha Rajesh leads sr. Aakruthi Plastic Surgery in Nellore, Andhra Pradesh, where she provides world-class care equipped with state-of-the-art technology. Her expertise attracts patients from across India and beyond, ensuring personalized treatments that enhance both confidence and well-being.

For consultations and more information, visit www.aakruthiplasticsurgery.com or contact +91 9885 2626 53 / +91 9885 2686 55.

📍 Location: Railway Track Line, Complex Road, Pogathota, Nellore, Andhra Pradesh - 524001.